Rotary peg-cutter



(No Model.)

H. 0.85 J. vN. TOWER.

ROTARY PEG GUTTER.

1Ptented Jan. 17,1882.

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N. Pampa Pnmumumpnar. wlmi c UNITED STATES PATENT OFFICE.

HERMON C. 'LOWER AND JOHN N. TOWER, OF HUDSON, MASSACHUSETTS.

ROTARY PEG-CUTTER.

'SPECIFICATION forming `part of Letters Patent No. 252,33*?, dated January 17, 17882.

Application filed July 8,1881. (No model.) v Y To all whom it may concern;

Beit know'n that I, HERMON C. TOWER and JOHN N. TOWER, of Hudson, State of Massa- .'chusetts, have invented an Improvement in with the surface of the inner sole, said imi provenienti having for its special object the ready adjustment of the height of such cutter relatively to the surrounding wall ofthe arm; and the invention consists in forming the gear which is directly in contact with and imparts motion to said rotary cutter with a nipple,

rim, or wall surrounding the pivotal screw,A

and'having an exterior screw-thread corresponding to and engaging an interior thread in said cutter, whereby such cutter can be removed from the gear without displacement of the latter, and a washer of any desired thickness interposed between the gear and cutter, whereby the latter will be so raised relatively to the'surrounding wall ot'pthevarin, all as wilt be hereinafter l'ully described in connection with the annexed drawings, and specifically deiined in the appended claims.

Figure 1 is a top or plan View of a portion of a machine lshowing my invention. Fig. 2 is a side elevation of Fig. 1. Fig. 3 is a longitudinal vertical section of the same.

In said views, a represents the upper portion of the usual arm,which is secured to the bed of the machine at any desired angle, and through which motion is imparted to the cutters by the small shaft b,journaledin said arm, and to the upper end of which is secured the small ruiter-gear c, as shown in Fig. 3. 4

A short tubular elbow, d, is threaded to arm a, as shown in said section, and in fact constitutes an extension of said arm, but is formed separate] y and then secured thereto for convenience ofconstruction and assembling of the several parts. In the Lipper cavity of said el- 'bow a seat is formed upon a shelf projecting from the inclosing wall, and upon said shelf is seated a small niiter-gear, c, that meshes with saidlower gear, c, from which latter said shelf-like seat on which gear c rests, the en.

larged portion of said screw'forming a shoulder which, by its contact with said seat, serves as a means of locking said screw in position so as to insure its not working loose by the action or frictional contact of gear e, which is journaled thereon.

Upon the upper face or side of gear e is formed the concentric wall g, which surrounds the aperture in the disk portion or body of the gear, the outer diameter of such wall heilig slightly more than the diameter ofthe head ot' screwf, and having cut upon it a screw-thread, which should be in its pitch or path opposite to theA direction of rotation of gear e and th'e cutter thereto secured, which in the drawings i threaded axial passage corresponding to the thread on rim g, which renders the engaging 0r disengaging of suoli cutter with or from the gear e but the workV ot' a moment, and this without disturbance of. either said gear or its pivotal screwf, asfthe passage in the cutter is of course greater than the headot said screw. When the teeth 't' of said cutter have become lowered either by use or sharpening, or both7 the cutter can be readily unscrewed from the y gear and a disk ot paper or other material introduced between them, thereby raising the cutter to the required height above the walls `of elbow cl.

Heretofore either the cutter and gear e have been both directly secured in place by screw f, or said cutter has been secured to the gear by screws passingiup through the latter and threaded in the former. In such former case the interposition of a washer between the gear IOO in operation, While the other method of adjustment not only rendered it necessary to remove the gear in order to interpose said washer, but the cost of construction of the parts was materially increased. and the facility of duplication greatly reduced. Y

We claim- 1. The combination of gear e, having the eX- ternally-threaded wall or rim g, and the cutter h, having a corresponding interior threaded passage', and to be seated upon said gear, substantially as specified.

2. The combination vof gear e, having the externally-threaded Wall or ring g, the cutter h, having a corresponding interior threaded pas- 15 sage, and the self-locking screwf, to serve as the journal of said gear, substantially as specied.

HERMON o. TOWER. JOHN N. TOWER.

Witnesses: i

J osrAH S. WELSH, GEO. W. W. EDsoN. 

